Rotary pump



April 9, 1935. E. o. RODAWM` ROTARY PUMP 4 Sheets-Sheet 2 Filed DSG. 16,1953 I Il I 0 Roclwa I E. O. RODAVVAY ROTARY PUMP Filed DSO. 16, 41933April 9, 1935.

4 Sheets-Sheet 4 Patented Apr. 9, 1935 UNITED sTATEs PATENT OFFICEV1,997,233 ROTARY PUMP Edgar Orlando Rodaway,

assignor to Thomas Savery Pumps London, England Birmingham, England,Limited,

Application December 16, 1933, Serial No. 702,773 In Great BritainDecember 19, 1932 within the pump body part. In this channel arearranged impellers whichclosely t the sides of the channel. Theimpellers are connected to another and eccentrically placed part, andthe operation of the pump is effected by relative rotation of theimpellers and the annular channel.

The object of the present invention is to provide improved pumps theoutput of which can be readily adjusted or varied to suit different`Working conditions.

, The invention comprises pumps as aforesaid wherein the relativeeccentricity oi the annular channel and the part connected to theimpellers is eilected by rotation of an eccentrically mounted adjustingmember.

In the four accompanying sheets of explanatory drawingsz- Figure l is alongitudinal section o1 a rotary pump constructed in accordance withthis in-l vention, the adjustment of output being obtained by alteringthe position of the axis of the driving spindle relatively to the axisof the impellers. Figure 2 is a cross section through the member whichdrives the impellers, and Figure 3 is an end view of the pump showingthe driving spindle and its adjustable mounting.

Figure 4 is an elevation showing the annular channel and impellers, andFigure 5 is a sectional plan of the pump. Figure 6 is alongitudinalsection of a rotary. pump constructed in accordance with this inventionin which the adjustment of output is obtained by movement oi the axis ofthe annular channel and impellers relatively to the axis of the drivingspindle. Figure 'I is a cross section through the member which drivesthe impellers and Figure 8 is an end elevation showing a controllingdevice to be hereinafter described and associated with the annular channel.

Figure 91s an elevation showingthe annular channel and impellers, andFigure 10 is a sectional plan of the pump.

Figure 11 is a detail view showing the passages between the annularchannel and the inlet and outlet connections.'

Referring to Figures l`5, the body part of the pump consists or two mainparts a, b, which are held together by screws c. =In the one (a) is jmounted a rotatable bush d which at one end is formed with a ilange ehaving a small clearance between its periphery and the adjacent wall ofthe cavity in a. in which it is contained. The bush carrieseccentrically the driving spindle j on the inner end of which is formeda flange g which abuts at one side against the adjacent face of theaforesaid flange e, and in the opposite face of the ange g are formedthree radial slots h. Rotary motion is imparted to the spindle (Cl.10S-129) means of a notch i for engagement by a tool or lever wherebythe bush can be rotated for altering the position of the axis of thespindle f.

The annular channel a' containing the segmental impellers k is formed inthe body part b. In the construction shown a circular recess is formedin the inner face of the body part b, and in the centre oi the space issecured a plug Z, the annular space between the outer periphery of thisplugv andthe inner periphery of the recess forming the channel. In thebase of the channel are cut two segmental grooves m, 11.. One of them(m) communicates with an inlet passage o in the body part, and the other(n) communicates with the outlet passage p. To avoid intersection of thegroove 11, by the passage o the groove n is stepped or made shalloweradjacent to the passage than elsewhere as shown at the right hand sideof Figure.

On looking at the drawings, it will be seen that whereas the axis of thespindle f is in the same plane as the axis of the channel 'in theelevation shownat Figure 1,. the two axes are displaced slightly in thehorizontal plane as shown in Figures 2, 4 and 5. The amount of thisdisplacement, upon which the rate of delivery of the pump depends, canbe varied by rotational adjustment of the bush d in the body part Thedisposition of the axis of the bush in relation to the other two axes,is such that .when the bush is rotated the axis of f moves along-an arcof a circle relatively to the axis of y' such that the movement isalmost along a short straight line, The amount oi adjustment movementwhich can be given to the spindle f is limited by the contact of oneside or the other of the flange e against the adjacent wall of thechamber in which it lies. This flange serves therefore in part as a stopfor limiting the adjustment movement. Its flat laces by close contactwith the adjacent ilat faces of the body part and the member g serve tomaintain a fluid tight seal which` prevents leakage of fiuidfrom theinterior of the pump.

Rotary motion of the impellers around the channel 7' is effected by pegsq the outer ends of which are fitted with rollers r and are located inthe radial slots h of the part g. These slots do not extend rightthrough the part g'but are closed at one side as shown in Figure 1 toavoid cutting into the fiat surface ci the part g which coacts with thecorresponding 'surface on the part e.

In the modification shown in Figures *6-11, the adjustment of output isobtained by moving the annular channel relatively to the axis of thespindle f. The ytwo pumps are essentially the same in action 'and thedescription of Figures 1-5 applies to a large extent to Figures 6-11. In

the following additional description of Figures 6-11 I will thereforeconfine myself to the differentiating features. Here the annularchamber` mounted in the part b is formed by a member t having a circularrecess or cavity in its front end. This part t is formed on one end ofan eccentric bush u which can be rotated by a handle v or other means.Within the bush u is mounted a spindle w on which is formed a flange :cwhich serves as the base of the annular chamber, and a central portion ycarrying a hardened ring I the periphery of which serves as the innercircumferential wall of the chamber, the outer wall being formed by thepart t. The connection between the impellers lc in the annular chamberand the slotted flange g of the driving spindle f is effected as alreadydescribed.

The part t lies within a circular cavity in the body' part b and ismovable in relation thereto by rotating the bush u, the amount ofmovement being limited by contact of peripheral portions of t withadjacent parts of the cavity in b. Looking at Figures 6 and 9 theposition of the axis of the bush u is such that rotational movement ofthe bush causes the axis of the spindle w to move along a short arc inrelation to the axis of the spindle f and so alter the relativepositions of those axes for varying the output of the pump. It isnecessary, however, to avoid imparting to the part :n (in which areformed passages l, 8) the same rotational movement as is imparted to thebush u, and this is effected by securing on the outer end of the spindlew a collar 2 (Figure 8) having formed at one side of it a notch 3 whichis engaged by a projection 4 fixed on the body part b. By this devicewhen the bush u is rotated it is rotated around the spindle w and thelatter receives only or mainly a simple displacement of its axisrelatively tothe axis of f.

The inlet and outlet passages in the body are indicated by o and p, andthese co'mmunicate through passages 5, 6, in the bush u, and arcuateslots 1, 8, in the part with the annular channel containing theimpellers, and the shape and disposition of these various passages(together with the device 3, 4, above described) are such thatadjustment of the bush u can be effected without interfering with theproper relationship of the passages and the gaps between the impellers.

By this invention I am able -to effect the required adjustment ofdelivery in pumps of the kind to which the invention relates in a verysimple and convenient manner. The invention is not limited to theexamples above described, and it will be readily understood that theparts may be so arranged that the impellers are held stationary and therotary motion is given to the channel. If desired also both the impellerand the annular' channel may be separately adjustable.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:-

1. In a rotary pump, the combination of relatively adjustable rotor andstator members, an annular channel in one of said members, a pluralityof impellers slidably iitted in said channel and connected with theother of said members, suction and delivery passages communicating withsaid channel,- a driving spindle rigid with the rotor member, and arotatable adjusting bush which carries one of the said members and whichis eccentrically mounted relatively to the driving spindle and to theannular channel, substantiall as described. i 2. In a rotary pump, thecombination 'of a stator, an annular channel in the stator, anadjustablerotor having a driving spindle, a plurality of impellers slidably ttedin said channel, interconnecting means between the impellers and therotor, suction and delivery passages communicating with said channel,and a rotatable adjusting bush which eccentrically carries the saidspindle and which is itself eccentrically mounted relatively to the saidannular'channel, substantially as described.

3. In a rotary pump, the combination of a stationary body part, acylindrical cavity in the body part, an annular channel in one of theflat walls of the cavity, an adjustable rotor arranged in the cavity andhaving a driving spindle, radial slots formed in the rotor, a pluralityof impellers slidably fitted in said channel, projections carried by theimpellers and slidably engaging said slots, suction and deliveryvpassages communicating with said channel,'and a rotatable busheccentrically carrying the said spindle, the said bush beingeccentrically mounted, relatively to the annular channel, in the otherof the said flat walls, and being provided with an integral flange whichis contained in said cavity and is adapted to limit the adjustmentmovement of the bush by the contact of its periphery with thecircumferentialv wall of the cavity, substantially as described.

4. In a rotary pump, the combination with a rotor having a fixed axisand provided Wth a driving spindle, of a stator including adjustable andnon-adjustable parts, an annular channel in the adjustable part, aplurality of impellers slidably fitted in said channel, interconnectingmeans between the impellers and the rotor, suction and delivery passagescommunicating with said channel, and a rotatable adjusting bush whicheccentrically carries the said adjustable part and which is itselfeccentrically mounted relatively to the said driving spindle,substantially as described.

5. A rotary Apump as claimed in claim 4, in y which the adjustablepart-of the stator comprises a cylindrical part forming the outer wallof the annular channel, a second cylindrical part forming the inner wallof the channel, a circular piece forming the base of the channel, and asupporting spindle carrying both the said second cylindrical part andthe circular piece, the said supporting spindle being carried by theadjustable bush and having means for engaging the non-adjustable part ofthe stator.

6. In a rotary pump, the combination with a .rotor having axed axis andprovided with a driving spindle, of a stator including adjustable andnon-adjustable parts, a cylindrical cavity in the non-adjustable statorpart, an annular channel in the adjustable stator part, radial slotsformed in the rotor, a plurality of impellers slidably fitted in saidchannel, projections carried by the said impellers and slidably engagingsaid slots, suction and delivery .passages communicating with saidchannel, a rotatable adjusting bush which eccentrically carries the saidadjustable part and which is itself eccentrically mounted relatively tothe said driving spindle, the said adjustable part being provided withanintegral flange which surrounds the said channel and which is mountedin the said cavity so that the adjustment movement of the bush islimited solely by contact of the periphery of the iiange with the'circumferential wall of th cavity, substantially as described.

`EDGAR ORLANDO RoDAwAY.

